Which one is better: bose qc15 or Beats Studio Heaphones?

I can answer this question because I had both of them...My QC15s were awesome...when I didn't have high quality hardware pumping my music. Now I push my music through the Droid X2 and Poweramp Software....the range that I get with my Beats are incredible!! I was going to upgrade to the Pros..but I didn't want to give up my Studios! I listen to what you listen to and I promise you..these headphones are awesome!!

The QC15 noise canceling feature is top of its class. (If that's important to you.) They are way better than the studios in that regard. I haven't tested both for sound quality comparison though so I have no opinion on that.